diff --git a/src/arcaea_offline/external/arcaea/__init__.py b/src/arcaea_offline/external/arcaea/__init__.py
new file mode 100644
index 0000000..9c2d4b7
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/__init__.py
@@ -0,0 +1,2 @@
+from .packlist import PacklistParser
+from .songlist import SonglistDifficultiesParser, SonglistParser
diff --git a/src/arcaea_offline/external/arcaea/common.py b/src/arcaea_offline/external/arcaea/common.py
new file mode 100644
index 0000000..97d3b20
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/common.py
@@ -0,0 +1,55 @@
+import json
+from os import PathLike
+from typing import Any, List, Optional, Union
+
+from sqlalchemy import Engine
+from sqlalchemy.orm import DeclarativeBase, Session
+
+
+def to_db_value(val: Any) -> Any:
+    if not val:
+        return None
+    elif isinstance(val, list):
+        return json.dumps(val, ensure_ascii=False)
+    else:
+        return val
+
+
+def is_localized(item: dict, key: str, append_localized: bool = True):
+    item_key = f"{key}_localized" if append_localized else key
+    subitem: Optional[dict] = item.get(item_key)
+    return subitem and (
+        subitem.get("ja")
+        or subitem.get("ko")
+        or subitem.get("zh-Hant")
+        or subitem.get("zh-Hans")
+    )
+
+
+def set_model_localized_attrs(
+    model: DeclarativeBase, item: dict, model_key: str, item_key: Optional[str] = None
+):
+    if item_key is None:
+        item_key = f"{model_key}_localized"
+    subitem: dict = item.get(item_key, {})
+    if not subitem:
+        return
+    setattr(model, f"{model_key}_ja", to_db_value(subitem.get("ja")))
+    setattr(model, f"{model_key}_ko", to_db_value(subitem.get("ko")))
+    setattr(model, f"{model_key}_zh_hans", to_db_value(subitem.get("zh-Hans")))
+    setattr(model, f"{model_key}_zh_hant", to_db_value(subitem.get("zh-Hant")))
+
+
+class ArcaeaParser:
+    def __init__(self, filepath: Union[str, bytes, PathLike]):
+        self.filepath = filepath
+
+    def parse(self) -> List[DeclarativeBase]:
+        ...
+
+    def write_database(self, engine: Engine):
+        with Session(engine) as session:
+            results = self.parse()
+            for result in results:
+                session.merge(result)
+            session.commit()
diff --git a/src/arcaea_offline/external/arcaea/packlist.py b/src/arcaea_offline/external/arcaea/packlist.py
new file mode 100644
index 0000000..f4ae3f7
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/packlist.py
@@ -0,0 +1,31 @@
+import json
+from typing import List, Union
+
+from ...models.songs import Pack, PackLocalized
+from .common import ArcaeaParser, is_localized, set_model_localized_attrs
+
+
+class PacklistParser(ArcaeaParser):
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    def parse(self) -> List[Union[Pack, PackLocalized]]:
+        with open(self.filepath, "r", encoding="utf-8") as pl_f:
+            packlist_json_root = json.loads(pl_f.read())
+
+        packlist_json = packlist_json_root["packs"]
+        results = []
+        for item in packlist_json:
+            pack = Pack()
+            pack.id = item["id"]
+            pack.name = item["name_localized"]["en"]
+            pack.description = item["description_localized"]["en"] or None
+            results.append(pack)
+
+            if is_localized(item, "name") or is_localized(item, "description"):
+                pack_localized = PackLocalized(id=pack.id)
+                set_model_localized_attrs(pack_localized, item, "name")
+                set_model_localized_attrs(pack_localized, item, "description")
+                results.append(pack_localized)
+
+        return results
diff --git a/src/arcaea_offline/external/arcaea/songlist.py b/src/arcaea_offline/external/arcaea/songlist.py
new file mode 100644
index 0000000..d095760
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/songlist.py
@@ -0,0 +1,104 @@
+import json
+from typing import List, Union
+
+from ...models.songs import Chart, ChartLocalized, Song, SongLocalized
+from .common import ArcaeaParser, is_localized, set_model_localized_attrs, to_db_value
+
+
+class SonglistParser(ArcaeaParser):
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    def parse(self) -> List[Union[Song, SongLocalized, Chart, ChartLocalized]]:
+        with open(self.filepath, "r", encoding="utf-8") as sl_f:
+            songlist_json_root = json.loads(sl_f.read())
+
+        songlist_json = songlist_json_root["songs"]
+        results = []
+        for item in songlist_json:
+            song = Song()
+            song.idx = item["idx"]
+            song.id = item["id"]
+            song.title = item["title_localized"]["en"]
+            song.artist = item["artist"]
+            song.bpm = item["bpm"]
+            song.bpm_base = item["bpm_base"]
+            song.set = item["set"]
+            song.audio_preview = item["audioPreview"]
+            song.audio_preview_end = item["audioPreviewEnd"]
+            song.side = item["side"]
+            song.version = item["version"]
+            song.date = item["date"]
+            song.bg = to_db_value(item.get("bg"))
+            song.bg_inverse = to_db_value(item.get("bg_inverse"))
+            if item.get("bg_daynight"):
+                song.bg_day = to_db_value(item["bg_daynight"].get("day"))
+                song.bg_night = to_db_value(item["bg_daynight"].get("night"))
+            if item.get("source_localized"):
+                song.source = item["source_localized"]["en"]
+            song.source_copyright = to_db_value(item.get("source_copyright"))
+            results.append(song)
+
+            if (
+                is_localized(item, "title")
+                or is_localized(item, "search_title", append_localized=False)
+                or is_localized(item, "search_artist", append_localized=False)
+                or is_localized(item, "source")
+            ):
+                song_localized = SongLocalized(id=song.id)
+                set_model_localized_attrs(song_localized, item, "title")
+                set_model_localized_attrs(
+                    song_localized, item, "search_title", "search_title"
+                )
+                set_model_localized_attrs(
+                    song_localized, item, "search_artist", "search_artist"
+                )
+                set_model_localized_attrs(song_localized, item, "source")
+                results.append(song_localized)
+
+        return results
+
+
+class SonglistDifficultiesParser(ArcaeaParser):
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def parse(self) -> List[Union[Chart, ChartLocalized]]:
+        with open(self.filepath, "r", encoding="utf-8") as sl_f:
+            songlist_json_root = json.loads(sl_f.read())
+
+        songlist_json = songlist_json_root["songs"]
+        results = []
+        for song_item in songlist_json:
+            if not song_item.get("difficulties"):
+                continue
+
+            for item in song_item["difficulties"]:
+                chart = Chart(song_id=song_item["id"])
+                chart.rating_class = item["ratingClass"]
+                chart.rating = item["rating"]
+                chart.rating_plus = item.get("ratingPlus") or False
+                chart.chart_designer = item["chartDesigner"]
+                chart.jacket_desginer = item.get("jacketDesigner") or None
+                chart.audio_override = item.get("audioOverride") or False
+                chart.jacket_override = item.get("jacketOverride") or False
+                chart.jacket_night = item.get("jacketNight") or None
+                chart.title = item.get("title_localized", {}).get("en") or None
+                chart.artist = item.get("artist") or None
+                chart.bg = item.get("bg") or None
+                chart.bg_inverse = item.get("bg_inverse")
+                chart.bpm = item.get("bpm") or None
+                chart.bpm_base = item.get("bpm_base") or None
+                chart.version = item.get("version") or None
+                chart.date = item.get("date") or None
+                results.append(chart)
+
+                if is_localized(item, "title") or is_localized(item, "artist"):
+                    chart_localized = ChartLocalized(
+                        song_id=chart.song_id, rating_class=chart.rating_class
+                    )
+                    set_model_localized_attrs(chart_localized, item, "title")
+                    set_model_localized_attrs(chart_localized, item, "artist")
+                    results.append(chart_localized)
+
+        return results
diff --git a/src/arcaea_offline/external/arcaea/st3.py b/src/arcaea_offline/external/arcaea/st3.py
new file mode 100644
index 0000000..fd2ddf0
--- /dev/null
+++ b/src/arcaea_offline/external/arcaea/st3.py
@@ -0,0 +1,44 @@
+import sqlite3
+from typing import List
+
+from ...models.scores import Score
+from .common import ArcaeaParser
+
+
+class St3ScoreParser(ArcaeaParser):
+    CLEAR_TYPES_MAP = {0: -1, 1: 1, 2: 1, 3: 1, 4: 1, 5: 1}
+
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    def get_score_items(self) -> List[Score]:
+        items = []
+        with sqlite3.connect(self.filepath) as st3_conn:
+            cursor = st3_conn.cursor()
+            db_scores = cursor.execute(
+                "SELECT songId, songDifficulty, score, perfectCount, nearCount, missCount, date FROM scores"
+            ).fetchall()
+            for song_id, rating_class, score, pure, far, lost, date in db_scores:
+                db_clear_type = cursor.execute(
+                    "SELECT clearType FROM cleartypes WHERE songId = ? AND songDifficulty = ?",
+                    (song_id, rating_class),
+                ).fetchone()[0]
+                r10_clear_type = self.CLEAR_TYPES_MAP[db_clear_type]
+
+                date_str = str(date)
+                date = None if len(date_str) < 7 else int(date_str.ljust(10, "0"))
+
+                items.append(
+                    Score(
+                        song_id=song_id,
+                        rating_class=rating_class,
+                        score=score,
+                        pure=pure,
+                        far=far,
+                        lost=lost,
+                        date=date,
+                        r10_clear_type=r10_clear_type,
+                    )
+                )
+
+        return items
diff --git a/src/arcaea_offline/external/arcsong/__init__.py b/src/arcaea_offline/external/arcsong/__init__.py
new file mode 100644
index 0000000..be8d034
--- /dev/null
+++ b/src/arcaea_offline/external/arcsong/__init__.py
@@ -0,0 +1 @@
+from .arcsong_db import ArcsongDbParser
diff --git a/src/arcaea_offline/external/arcsong/arcsong_db.py b/src/arcaea_offline/external/arcsong/arcsong_db.py
new file mode 100644
index 0000000..7245280
--- /dev/null
+++ b/src/arcaea_offline/external/arcsong/arcsong_db.py
@@ -0,0 +1,37 @@
+import sqlite3
+from typing import List
+
+from sqlalchemy import Engine
+from sqlalchemy.orm import Session
+
+from ...models.songs import ChartInfo
+
+
+class ArcsongDbParser:
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def parse(self) -> List[ChartInfo]:
+        results = []
+        with sqlite3.connect(self.filepath) as conn:
+            cursor = conn.cursor()
+            arcsong_db_results = cursor.execute(
+                "SELECT song_id, rating_class, rating, note FROM charts"
+            )
+            for result in arcsong_db_results:
+                chart = ChartInfo(
+                    song_id=result[0],
+                    rating_class=result[1],
+                    constant=result[2],
+                    note=result[3] or None,
+                )
+                results.append(chart)
+
+        return results
+
+    def write_database(self, engine: Engine):
+        with Session(engine) as session:
+            results = self.parse()
+            for result in results:
+                session.merge(result)
+            session.commit()
diff --git a/src/arcaea_offline/external/scores/__init__.py b/src/arcaea_offline/external/scores/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/arcaea_offline/external/scores/common.py b/src/arcaea_offline/external/scores/common.py
deleted file mode 100644
index bea5ff0..0000000
--- a/src/arcaea_offline/external/scores/common.py
+++ /dev/null
@@ -1,20 +0,0 @@
-import dataclasses
-from typing import List
-
-
-@dataclasses.dataclass
-class ExternalScoreItem:
-    song_id: str
-    rating_class: int
-    score: int
-    pure: int = -1
-    far: int = -1
-    lost: int = -1
-    max_recall: int = -1
-    clear_type: int = -1
-    time: int = -1
-
-
-class ExternalScoreSource:
-    def get_score_items(self) -> List[ExternalScoreItem]:
-        ...
diff --git a/src/arcaea_offline/external/scores/st3.py b/src/arcaea_offline/external/scores/st3.py
deleted file mode 100644
index a17d889..0000000
--- a/src/arcaea_offline/external/scores/st3.py
+++ /dev/null
@@ -1,43 +0,0 @@
-import sqlite3
-from typing import Union
-
-from .common import ExternalScoreItem, ExternalScoreSource
-
-
-class St3ScoreSource(ExternalScoreSource):
-    db_path: Union[str, bytes]
-    CLEAR_TYPES_MAP = {0: -1, 1: 1, 2: 1, 3: 1, 4: 1, 5: 1}
-
-    def __init__(self, db_path: Union[str, bytes]):
-        self.db_path = db_path
-
-    def get_score_items(self):
-        items = []
-        with sqlite3.connect(self.db_path) as st3_conn:
-            cursor = st3_conn.cursor()
-            db_scores = cursor.execute(
-                "SELECT songId, songDifficulty, score, perfectCount, nearCount, missCount, date FROM scores"
-            ).fetchall()
-            for song_id, rating_class, score, pure, far, lost, date in db_scores:
-                db_clear_type = cursor.execute(
-                    "SELECT clearType FROM cleartypes WHERE songId = ? AND songDifficulty = ?",
-                    (song_id, rating_class),
-                ).fetchone()[0]
-                clear_type = self.CLEAR_TYPES_MAP[db_clear_type]
-
-                date_str = str(date)
-                date = None if len(date_str) < 7 else int(date_str.ljust(10, "0"))
-
-                kwargs = {
-                    "song_id": song_id,
-                    "rating_class": rating_class,
-                    "score": score,
-                    "pure": pure,
-                    "far": far,
-                    "lost": lost,
-                    "clear_type": clear_type,
-                }
-                if date:
-                    kwargs["time"] = date
-                items.append(ExternalScoreItem(**kwargs))
-        return items